/Engine/Source/Runtime/Engine/Public/UnrealEngine.h
Helper function for changing system resolution via the r.setres console command This function will set r.setres, which will trigger a resolution change later on when the console variable sinks are called
static void RequestResolutionChange ( int32 InResX, int32 InResY, [EWindowMode::Type](API\Runtime\ApplicationCore\GenericPlatform\EWindowMode__Type) InWindowMode )